Tampico Gumbo Filé powder is the dried, powdered leaves of the sassafras tree. Used in Creole and Cajun dishes like Gumbo. Filé is more than a thickener; it also imparts an earthy flavor and has a fruity aroma like coriander seeds. Add filé to Gumbo or other liquid mixtures shortly before serving. Adding it while the liquid is boiling can yield a stringy or slimy texture. For the same reason do not add the filé during the initial cooking; wait until it is re-heated and you are ready to serve....